Mapping Curve Parameter Adjustment for Display Luminance
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Solution Overview
Problem
Existing dynamic-range mapping methods, such as static and dynamic mapping, fail to provide accurate tone adjustment on display devices with different luminance, leading to information loss or increased data requirements, affecting image display quality.
Innovation Solution
A method and apparatus for obtaining a mapping curve parameter set by adjusting parameters based on display luminance, maximum target system display luminance, and adjustment coefficients, using formulas to calculate adjusted parameters for improved flexibility and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single mapping curve is used for all scenes (static mapping), then data transmission is reduced and processing is simplified, but information loss occurs in certain scenes due to inadequate tone adjustment for different luminance levels
Solution Approach 1:
The patent implements dynamic mapping by adjusting the mapping curve parameters based on scene luminance characteristics. The system dynamically selects or modifies mapping curves according to the actual luminance range of each scene, enabling adaptive tone adjustment that preserves image details across varying luminance conditions while maintaining reasonable processing complexity through automated parameter selection.
Solution Approach 2:
The patent changes the parameters of the mapping curve based on scene luminance characteristics. By modifying the mapping curve parameters (such as slope, intercept, or curve shape) according to the detected luminance range, the system adapts the tone mapping process to different scenes, preventing information loss in both bright and dark regions while keeping the overall system complexity manageable through parameter-based adaptation.
2Measurement precision
If differentiated mapping curves are used for different scenes (dynamic mapping), then tone adjustment accuracy is improved, but data transmission volume increases due to scene information requirements
Solution Approach 1:
Instead of transmitting complete scene information or separate mapping curves for each scene, the patent transmits only the necessary parameter changes or adjustment coefficients that define the mapping curve. This approach maintains high tone adjustment accuracy by providing scene-specific mapping parameters while significantly reducing data transmission volume compared to transmitting full scene descriptions or multiple complete curves.
Solution Approach 2:
The patent extracts only the essential parameters needed for mapping curve adjustment from the complete scene information. By identifying and transmitting only the critical parameters (such as luminance range boundaries or curve adjustment coefficients) rather than the entire scene description, the system achieves accurate tone adjustment with minimal data transmission requirements.
3Reliability
If mapping curves are optimized for bright regions, then highlight preservation is improved, but details in dark scenes are lost or become invisible
Solution Approach 1:
The patent applies local quality by using different mapping curve parameters or adjustment strategies for different luminance regions within the same image. The system detects the luminance distribution and applies appropriate mapping parameters that preserve highlights in bright regions while simultaneously maintaining detail visibility in dark regions, rather than using a uniform mapping curve for the entire image.
Solution Approach 2:
The patent dynamically adjusts the mapping curve parameters based on the detected luminance characteristics of each scene. When bright regions are detected, the parameters are optimized for highlight preservation; when dark scenes are detected, the parameters are adjusted to enhance dark region visibility. This dynamic adaptation ensures both highlight preservation and dark region detail retention across varying scene conditions.
Data Source
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AI summary
A mapping curve parameter obtaining method and apparatus are provided. The method includes: obtaining a first mapping curve parameter set and first maximum target system display luminance (1001); obtaining a display luminance parameter set (1002), where the display luminance parameter set includes maximum display luminance and/or minimum display luminance of a display device; obtaining an adjustment coefficient set (1003), where the adjustment coefficient set includes one or more adjustment coefficients, and the one or more adjustment coefficients correspond to one or more parameters in the first mapping curve parameter set; and adjusting the one or more parameters in the first mapping curve parameter set based on the display luminance parameter set, the first maximum target system display luminance, and the adjustment coefficient set to obtain a second mapping curve parameter set (1004), where the second mapping curve parameter set includes one or more adjusted parameters. According to the method, more accurate tone adjustment can be performed on display devices with different luminance. This greatly improves flexibility.